Markandeyapurana 32.27

32.27

śraddhayā parayā dattaṃ pitṝṇāṃ nāmagotrataḥ /
yadāhārāstu te jātāstadāhāratvameti tat //

Whatever, in the shape of articles of food possessed by thee, is given with supreme faith to the pitṛs according to their name and family, that becomes food for them. Hence a man of faith, who desires the pitṛs’ satisfaction, must place the best that he has in the vessel and according to rule at a ceremony to the pitṛs.